甘蓝枯萎病菌寄主范围研究

The host range of Fusarium oxysporum f.sp.conglutinans

甘蓝枯萎病于2001年最先在北京延庆发现，目前已扩散到山西、河北、甘肃及陕西等北方甘蓝生产基地，重病区发病率高达80％以上．对甘蓝生产造成了严重的威胁。国内外对甘蓝枯萎病寄主范围的研究仅限于十字花科作物，对该病原菌是否侵入其他类蔬菜及1、2号生理小种侵染十字花科寄主的差异尚未见报道。本文采用人工接种的方法，综合分析甘蓝枯萎病菌对主要大田蔬菜作物的侵染寄生能力，为制定合理的轮作防病措施提供理论依据。

The host range of Fusarium oxysporum f. sp. conglutinans was tested by inoculating conidial suspension by root-dipping method. Experimental results showed that almost the tested cruciferous crops could infected , but the degree of disease severity was different due to different species and varieties, and race2 has a broader host range than race 1. Although non-cruciferous host does not show disease symptoms, but the 13 vegetable species which belongs to 7 families were asymptomatic carder except shallot. The pathogens mainly existed in roots but can generally move to stems. Cabbage was infected by back inoculated with the isolates ex- tracted from the asymptomatic carder host. Thus our data show that F. oxysporum f. sp. conglutinans can be colonized in cruciferous as well as in other vegetable crops, making it possible to be infection source of Brassica oleracea in next season.